'cconn' will never be NULL in cxgbi_conn_alloc_pdu() so remove NULL check.

Link: https://lore.kernel.org/r/1594741751-3323-1-git-send-email-varun@chelsio.comReported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Varun Prakash <varun@chelsio.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>